We haven't had sex for 6 months now and our sexual activity has reduced, especially after the baby was born. Is it okay?

Don't be discouraged. When I had my first child, I did not even dare to have sex for 9 months as I was afraid my wounds have not healed completely and I would get pregnant again which we are not prepared. On top of that, I was so dead tired from taking care of my firstborn. Sex is the last thing I would want coz I was sleep deprived. My hub was understanding and he would self relieve.